76dB/W(m) ± 3dB at AVE 1.0K, 1.2K, 1.5K, 1.8K, (Hz)
7
Sound Pressure Level
90dB/0.3W(0.1m)
8
Frequency Range
Fo – 20 KHz
9
Distortion
10% lessthan 0.3W, 1KHz morethan
10
Max. Input Power
0.5W
11
Voice Coil
Diameter 8.5mm
12
Magnet
Rare earth permanent (Nd-Fe-B)Magnet ?8.0 x 1.0 mm
13
Appearance
Should not exist any obstacle to be harmful to normal operation;
damages, cracks, rusts and distortions, etc.
14
Operation Test
Must be normal at program source –0.3 W
15
Buzz, Rattle, etc.
Should not be audible at 1.55V sine wave between Fo Hz to
20KHz
16
Polarity
When positive voltage is applied to the terminal marked (+),
diaphragm should move to the front.
17
Load Test
Must be normal after load test : white noise 1.55 volts(RMS)
24 hours
18
High Temp. Test
+55±2℃ Humidity random for 48 hours
19
Low Temp. Test
-25±2℃ Humidity random for 48 hours
20
Humidity Test
+40±2℃ Rrlative humidity 90~95% for 48 hours
21
Drop Test
Drop the speakers contained in normal box onto the board 20mm
thick 10 times from the height of 0.75m and then should satisfy
the tests listed on item 13 and 15
